Lazy statement that “sourcing” a vegetarian meal is difficult.
Eating less meat is better for your health and better for the planet.
The few exceptions I think worth noting are if you were born into and continue to live in largely/culturally hunter culture (Inuit, bushmen) or where you live is not sustainable for agriculture (Tibet.)
Most folks could just cook more rice, beans, greens and be fine.
I don't think a lot of people like you understand the real state of things, how a lot of stuff gets done, costs and what's needed for it. One is the quick maffs you do in your head and it's a different thing how real people in real situations behave at scale. You cannot shame billions of people into not eating meat, they'll just come for you and anyone deciding it for them. You need to have a realistic alternative for it, this shaming nonsense is puerile and gets us nowhere, just allows you to finger wag from your high horse is all. I find this perspective and way to go about it extremely shallow and childish.